/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/ViewModels/HierarchyEditor/NiagaraUserParametersHierarchyViewModel.h
class FNiagaraUserParameterHierarchyDragDropOp : public [FNiagaraHierarchyDragDropOp](API\Plugins\NiagaraEditor\ViewModels\HierarchyEditor\FNiagaraHierarchyDragDropOp)